They comprise more than 600 genera and about 4000 species found all over the world.

The family comprises about 16 genera, totalling a hundred species.

The family Peltoperlidae comprises 6 genera and 18 known species.

Two subfamilies, comprising eight genera and 43 species, are currently recognized.

It comprises 11 orders 90 families, 1300 genera and over 19,000 known species.

Fifteen families are currently recognized, comprising 456 genera and over 2,900 species.

It comprises 10 genera, of which Tectaria is by far the largest.

Are usually with milky sap comprising about 200 genera and 2,000 species.

The Microphysidae are a very small family of bugs, comprising only 5 genera.

The Peloridiidae are a family of true bugs, comprising 17 genera and 36 species.